Chaos Progenitus is a trading dice game for 2 or more players where you create a fiend, represented by 13 dice which fall into two categories: items and body parts. The fiends battle until one is defeated. Different combinations of dice and ink color represent different breeds of fiends, and each fiend must contain at least one body part. The object of the game is to be the last player that is able to roll at least one body part die at the beginning of his or her turn -- if you fail to do so, you lose the game.
The basic turn consists of the following actions: applying "minuses" that your foe rolled in the previous turn, rolling your dice that are still in play, setting aside "minuses" to apply against your foes next turn, select your defenses against your foes attacks, array your own attacks against your opponent, recovering from stuns and wounds, and finally, suffering stuns and wounds from your opponents attacks.
The advanced game adds breed abilities, "counting coup" (winning player selects a wounded die to keep as a trophy), and multi-player rules.
Chaos Progenitus is expanded by Plague Beasts.
Every Plague Beasts Booster Pack contains eight more six-sided dice to build your fiends. Six are randomly selected from the three new breed colors, and the other two from the five breeds already presented in the Starter Set.
Each booster has 3 Fester fiend dice, 2 Rot fiend dice, 1 Stench fiend die, and 2 random dice from the starter races.